What is CVE-2026-12459?

CVE-2026-12459 is a medium-severity vulnerability in Apple macOS, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-17.

How severe is CVE-2026-12459?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Apple macOS

CVE-2026-12459

Inappropriate implementation in Serial in Google Chrome prior to 149.0.7827.155 allowed a remote attacker to inject arbitrary scripts or HTML (UXSS) via a crafted HTML page. (Chromium security severity: High)

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-06-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (6.9th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_0175051… (Vendor Advisory)
issues.chromium.org/issues/517406035 (Permissions Required)

Frequently asked questions

What is CVE-2026-12459?: CVE-2026-12459 is a medium-severity vulnerability in Apple macOS, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-17.
How severe is CVE-2026-12459?: Medium severity. CVSS v3 base score is 6.1 out of 10.